Air-pressure gauge



A. E. CARLISS AIR FRESSURE GAUGE Sept. 25, 1928. I 1,685,273

Filed Sept. 50, 1927 2 Sheets-Shet 1 1cm ml I I INVENTOR.

ATTORNEY Patented Sept. 25, 1928.-

UNITED STATES ALBERT E. GARLISS, or none]; rAumNEwYonK, assreuoa roAoMn AIR ANCE 00., me, A CORPORATION or NEW YORK.

' n eam smear:orrics. j

y nrarnnssunn GAUGE.

Application filed. September 30, 1927. Serial Iva/222,936.

particularly to means for restoring the indieating hand to its zero position with reference to a suitable index. It is addressed also to the solution of theproblem of economy of construction and simplicity of operation. The invention is illustrated in the accompanying drawings, wherein the individual parts are designated by numerals, like parts being referred to by likenumerals.

Figure 1 is a plan view of the assembled gauge, as viewed from the'top.

Figure 2- is a plan view of the index and window supporting means, as VIGWE-Cl from the bottom. y

Figure 3 is a'detail cross section of a Bourdon tube. taken on the line Si 3 of Figure 4. Figure 4; is a plan view with the top casing and index plate removed.

Figure 5 is a vertlcal section of Figure 4:, on the line 1, taken in the direction of the arrow 2. 1

Figure 6 is a detail vertical section of a 7 block of metal shown inFigure' 5 with certain associated elements;

Figure 7 is a vertical section-of an index plate.

Figure 8 is a vertical section of a window through which the index plate may be observed. 0 I Figure 9 is a vertical section ofa casing in which the gauge is mounted.

Figure'lO" is a vertical section of a push button plate. 7 I

- Figure 11 is a vertical section or a spring and pin adapted to cooperate with said push button plate shown in'Figure 10. I Figure 12 isa vertical section of the upper enclosing half of a casing. for said guage.

Figure 13' is the lower half of said external casing. v

The construction and assembly of the several parts will now be described.

3 is a block of metal, preferably ofrectangular form, having an extension n In original process of manufacture, the axis ofsaid block 3 and extension 4 13 the same. Under these conditions the extension 4 is readily turned in alathe in the form indicated and is axially bored with a conduit as5. An aperture as 6 is formed in the said extension 4, adapted to receive a suitable mecharespect to said index.

nism 7 adapted to cooperate with a valve such as 1s commonly used in association with an inflated tire, so that when the mechanism 1 is pressed against a yielding element in said valve mechanism of the tire, the air under pressure in the tire will flow into and through the conduit 5. lVhen the construction of this APPLI- extension 4: is'complet-ed, as indicated, the

tube section thereof is preferably bent asindicated in, the drawings, to accommodate ltself to aconvenicnt application of the gauge to such a valve mechanism. ne conduit 5, indicated in'dotted lines in Figure hvturns at right angles to'i-ts original course "at 8, where it emerges from theblock 3. 9 is a Bourdon tube, the structure. thereof being indicated in cross section-in Figure 3. The

base of this tube is secured to the block 3 at and the same is caused to expand according Y towell known principles, the hook 16 will;

engage the index hand 11 to cause the same to move in the arc of a circle, thereby, cooperating with the index17,as illustrated in Figure 1.

All of the foregoing combination of elements is well known in the art, and requires no further explanation concerning either construction or operation; 'l/Vhat, follows dealsparticularly with mechanism for-'restoring said index handto zero position with v'ihe said block of metal 3 is" provided with" a slot in a plane longitudinal of andperpendicul'ar to the top surface of said. block, said slot being indicated at- 18. Said block 3 is also provided-with three additional slots in; oarallel planesverticaland perpendicular to said alarm in which said longitudinal slot is I r L 'rormed, said slotsbeing indicatedas 19,-20 and 21. Said block 3 is'also provided witha vertical aperture as 22leading from'said slot 19 and adapted to receive a pin-as 235 24 is a crank arm bar provided at one end with a cranklcver 25 adapted to be engaged by said pin 23,,and at the other end with a crank lever 26 adapted to engage the index hand 11. The crank lever bar-.24 lies at the base of the slot 18 and is mounted for rotation therein. 27 is a spring bar anchored to theblock 3 at the point 28, and so bent as to fall within the slot 18 and bearupon the crank arm 24, as at 29, so as to maintain a spring tension on the crank arm bar 24. to hold the same in position when the said crank arm bar is caused to operate by the engagement of the pin 23 with the crank 25, and the engagement of the crank 26 with the index hand 11, both of which might operate to cause the displacement of the said crank arm bar 24, were it not for the tension of the said spring 27, operating to'hold the same at thebase of said slot 18. V

The assembly of the operating mechanism may be described as follows: 30 is a cupshaped element of rigid construction adapted to contain the mechanism above described as aninternal casing, said internal casing being 1 35 introduced through the aperture 36.

pierced axially with an aperture as S1 to receive push button to be hereafter described, and 32 is another aperture in the wall ot said internal casing, adapted to receive the air conspring 34 is caused to rest therein, and the pin 23 is introduced into the aperture 22. The assembled mechanism is introduced into the casing 30, the air pressure tube 4 passing through the aperture 32. It may be secured therein by suitable means as the screw The index plate exhibited in plan view, Figure 2,

and in section, Figure 7, is then introduced ing the said index plate in position.

beneath the indexhand 11, as indicated in Figure 1 at 37. vided on the under side thereof with lugs as 38, adapted to engage corresponding ap'er tures 39 in the periphery of the casing 30. 40 is another lug dependent y from said index plate, which isadapted to fall into the slot 21 and cooperatetherewith in the matter of hold- Said index plate is also provided with vertical lugs 41 struck up therefrom .so. as to form a hear ing for the transparent window plate shown in Figure 8.v In the assembly said index plate 37 is introduced belowthe index hand 11, the

' lugs registering with the apertures as above indicated. The transparent plate 42 is then caused to rest on the index'plate at the points 43 and 44. In Figure 12 is shown a vertical section ofthe top enclosing cap of the casing,

designated as 45. Said cap is provided with an aperture as 46 to serve as a window through which to view the index plate 37 and button The index plate 37 is pro-:

' an aperture 47 to'allow for the passage of the air tube 4. In Figure 13 is shown the bottom enclosing cap of the casing designated as 48. This bottom enclosing cap is provided with the aperture 49, allowing access to the push 50 is an aperture cooperating with the aperture 47 to form an opening through which the air tube 4 may pass.

The operation of thedevice is as follows: The whole assembly indicated in Figure'l is manipulated manually so that the mechanism 7 is caused to engage the valve of aninflated element, such as a tire. By such action the valve carried by the tire is opened through the compression of a suitable pin, and air under pressure is permitted toenter the conduit 5, and thence the Bourdon tube 9, causing the same to expand carrying with it the arm 14 so that the hook 16 engages the index hand 11, causing the same to move over the index 17, which is viewed throu h the aperture 46, into position as indicated in dotted lines in F ig iii-e4, designated as 51. Under these condi tions the gauge may be removed from the valve seat of the tire, and the index hand re- .main in a fixed position with reference to the gauge 17 because of the tension of the spring 13. The problem now is one of restoring the lndex hand 11 to its ero positlonwith reference to the index'17. Thisiis accomplished by exerting manual pressure onthe plate 33 to overcome the tension of the spring 34 and cause the plate 33 torengage the pin'28, thus forcing the pin 23 into engagement with the crank arm 25, thus causinga rotation of the cranklever 24 and also a movement of the crank arm 26. the index hand 11 and move the same back to a zero position with reference to the index plate 17. The device is now ready for another applica-tionto the source of air pressure in the manner indicated.

It will be noted that the spring arm29 bears on the crank rod 24 as previously stated with a spring tension. Attention is called to' the fact that this spring tension operates notonly to hold the crank arm 24 in position butalso to serve as a compensating element lying between said manual means of operation, to wit,-

The crankarm 26 will engage the push button, and also operates as a brake to prevent the recoil of the index finger where it is forced to zero position by the crank rotate said. hand, a. scale associated with said hand to indicate pressure as said hand travien' end thereof to operate as crank levers, said bar being mounted in said longitudinal slot, so that one of said right-angular extensions will operate in one of said slots to be engaged by said pin, and the other in the other of said slots to engage said index hand, an elastic element in the nature of a spring rod secured to said block, said spring rod adapted to rest Within said longitudinal slot to engage said crank lever bar so as to hold the same within said slot under tension, said pin adapted when manually operated to engage one of said ex-' tensions of said crank lever bar to rotate said bar, and the other crank arm adapted to engage said index hand to throw the same back to zero position with respect to said index.

2. In a pressure auge of the Bourdon tube type, an integral hlock of metal having a Bourbon tube attached at its base, and a conduit passing through said block and leading from a source of air pressure to the base of said tube, an index hand pivotally mounted on said block, means operated by the movement of the said tube under air pressure to rotate said hand, a scale associated with said hand to indicate pressure as said hand trav-" Verses said scale, said block having a slot formed therein in a plane perpendicular and longitudinal with respect to said block, two

other slots formedin said block in twoiparallel vertical planes perpendicular tosaid first mentioned plane, and a vertical aperture leading from that one of said slots fart-herest from thepoint of anchorage of the Bourdon tube, a pin mounted in said aperture and means for operating said pin manually, a crank lever bar having right-angular extensions at either end thereof to operate as crank levers, said bar being mounted in said longitudinal slot, so that one of saidright-angular extensions Will operate in one of said slots to be engaged by said pin, and the other inthe other of said slots to engage said index hand,

an elastic element in the nature of a spring rod secured to said block, said spring rod adapted to rest within said longitudinal slot to engage said crank lever bar so as to hold the same Withinsaid slo-t'under tension, said pin adapted when manually operated to engage one of said extensions of said crank lever bar to rotate said bar, and the other crank arm adapted to engagesaid index hand to throw the same back to zero position with re]- spect to said index, a casing adapted to enclose said gauge comprising an integral cup shaped element having an axial aperture therein, a push button mounted in said aperture adapted to engage said pin when com-' pressed manually, an aperture in the Wall of said caslng toaccommodatea conduit leading to a source of air pressure, and exterior easing formed of two cup-shaped elements snugly enclosing said first named cup-shaped element and having apertures in registry with said tivel Signed by me at New York city, this 26th.

day of September, v1927. v ALBERT E. CARLISS.

push button, conduit, and scale respec- 

